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Cool interstellar medium as an evolutionary tracer in ALMA-observed local dusty early-type galaxies
Popescu, Cristina C.; Davis, Timothy A.; Sansom, Anne E. +1 more
The content and distribution of cool interstellar medium (<30 K) can indicate the evolutionary mechanisms that transform late-type to early-type galaxies (ETGs). To investigate this, ALMA observations of 12CO[2-1] line emission were obtained for five dusty ETGs from a complete sample in low-density environments. Four of the ETGs have…
Prominence instability and CMEs triggered by massive coronal rain in the solar atmosphere
Hanslmeier, A.; Gömöry, P.; Zaqarashvili, T. V. +3 more
Context. The triggering process for prominence instability and consequent coronal mass ejections (CMEs) is not fully understood. Prominences are maintained by the Lorentz force against the gravity; therefore, reduction of the prominence mass due to the coronal rain may cause the change of the force balance and hence destabilisation of the structur…
Blackbody Temperature of 200+ Stellar Flares Observed with the CoRoT Satellite
Rabello Soares, M. Cristina; de Freitas, Marcia C.; Ferreira, Bernardo P. L.
We estimated blackbody temperature for 209 flares observed at 69 F-K stars, significantly increasing the number of flare temperature determinations. We used the Blue and Red channels obtained by the 27 cm telescope of the CoRoT satellite at high cadence and long duration. The wavelength limits of the channels were estimated using spectra from the …
PSP/IS⊙IS Observation of a Solar Energetic Particle Event Associated with a Streamer Blowout Coronal Mass Ejection during Encounter 6
Palmerio, E.; Mitchell, D. G.; McComas, D. J. +21 more
In this paper we examine a low-energy solar energetic particle (SEP) event observed by IS⊙IS's Energetic Particle Instrument-Low (EPI-Lo) inside 0.18 au on 2020 September 30. This small SEP event has a very interesting time profile and ion composition. Our results show that the maximum energy and peak in intensity are observed mainly along the ope…
A Time-dependent Self-similar Reconstruction of Solar Coronal Mass Ejections Based on the Gibson-Low Model
Dai, Xinghua
The analytic Gibson-Low (GL) model, a time-dependent self-similar solution of the magnetohydrodynamics, is first used to directly reconstruct a coronal mass ejection (CME) through the method of forward modeling in this study. A systematic description of the GL model is presented at the beginning, and a set of parameters is introduced to define the…
Discovery and origin of the radio emission from the multiple stellar system KQ Vel
Umana, G.; Owocki, S. P.; Fossati, L. +20 more
KQ Vel is a binary system composed of a slowly rotating magnetic Ap star with a companion of unknown nature. In this paper, we report the detection of its radio emission. We conducted a multifrequency radio campaign using the ATCA interferometer (band-names: 16 cm, 4 cm, and 15 mm). The target was detected in all bands. The most obvious explanatio…
Relative Astrometry in an Annular Field
Lattanzi, M. G.; Busonero, D.; Butkevich, A. G. +4 more
Background. Relative astrometry at or below the microarcsec level with a 1 m class space telescope has been repeatedly proposed as a tool for exo-planet detection and characterization, as well as for several topics at the forefront of Astrophysics and Fundamental Physics. Aim. This paper investigates the potential benefits of an instrument concept…
Magnetic fields and hot gas in M 101
Ehle, M.; Weżgowiec, M.; Soida, M. +4 more
Context. Studies of nearby spiral galaxies in radio and X-ray wavelengths reveal the structure and energy balance of the magnetic fields and the hot interstellar medium (ISM). In some spiral galaxies, large-scale ordered magnetic fields have been found between the spiral stellar arms (the so-called magnetic arms). One of the considered explanation…
Density exponent analysis: gravity-driven steepening of the density profiles of star-forming regions
Li, Guang-Xing; Zhou, Ji-Xuan
The evolution of molecular interstellar clouds is a complex, multiscale process. The power-law density exponent describes the steepness of density profiles, and it has been used to characterize the density structures of the clouds; yet its usage is usually limited to spherically symmetric systems. Importing the Level-Set Method, we develop a new f…
Stellar populations of the globular cluster NGC 5053 investigated using AstroSat-Ultra Violet Imaging Telescope
Nikitha, K. J.; Vig, S.; Ghosh, S. K.
Globular clusters (GCs), being old and densely packed, serve as ideal laboratories to test stellar evolution theories. Although there is enormous literature on GCs in optical bands, studies in the ultraviolet (UV) regime are sparse. In this work, we study the stellar populations of a metal-poor and a rather dispersed GC, NGC 5053, using the UV ins…